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if they have the same error there is nothing you can do...i dont think they let you edit code if they do. Replace a sample pages code with a valid code to see if it is caused the core or fronted.

I know it's possible since I've read a part regarding the said topic on a SitePoint book a long time ago from the library. If I'm not mistaken, it's from SitePoint's Build Your Own Web Site The Right Way Using HTML and CSS.

The point is that it is possible. How? That's what I'm trying to find out. Any mods or power users who want to shed light on this topic?

There's no inherent search benefit to proper markup. Search spiders are perfectly capable of crawling and parsing websites with markup as poor as Google's own. They're out to index the entire web, even pages made before current standards existed.

If you write in HTML4+ and CSS rather than using inline stylistic tags and tables for layout as everyone used to, you can see some benefit from more of your page text being near the top of the page and in the first X bytes of the file. But that's really not all that significant and perfectly possible without anything validating as well.

If your page is written so poorly that it only renders in Internet Explorer, then fixing the errors so that other browsers can render the page correctly can have indirect effects on your search ranks. A growing portion of internet users use alternative browsers, and they're not likely to link to your site or tell friends about it if it doesn't display right on their systems. That's lost opportunities for traffic and links that could be helping.